METER / GAUGE SYSTEM Tachometer Malfunction

DESCRIPTION

In this circuit, the combination meter assembly receives engine speed signals from the ECM via the CAN communication system. The combination meter assembly displays the engine speed calculated based on the data received from the ECM.

WIRING DIAGRAM

B003QNXE14
*1 Combination Meter Assembly
*2 CAN Communication Line

CAUTION / NOTICE / HINT

Note


  • When replacing the combination meter assembly, make sure to replace it with a new one.

  • Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed.

PROCEDURE


  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)


    1. Check for DTCs.

      Click here

      OK
      No DTCs are output.
      Result
      Result
      OK
      NG

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

  2. CHECK FOR DTC (ECD SYSTEM)


    1. Check for DTCs.

      Click here


      Powertrain > Engine and ECT > Trouble Codes
      OK
      No DTCs are output.
      Result
      Result
      OK
      NG

    NG

    GO TO ECD SYSTEM Click here

    OK

  3. PERFORM ACTIVE TEST USING GTS (TACHOMETER OPERATION)


    1. Using the GTS, perform the Active Test.

      Click here


      Body Electrical > Combination Meter > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      TachoMeter Operation Tachometer OFF, 0, 1000, 2000, 3000, 4000 or 5000 (rpm) -

      Body Electrical > Combination Meter > Active Test
      Tester Display
      TachoMeter Operation
      OK
      Tachometer indication is normal.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  4. READ VALUE USING GTS (ENGINE SPEED, ENGINE RPM)


    1. Using the GTS, read the Data List.

      Click here


      Powertrain > Engine and ECT > Data List
      Tester Display Measurement Item Normal Condition Reference Value Diagnostic Note
      Engine Speed Engine speed Min.: 0 rpm, Max.: 16383 rpm Actual engine speed -

      Body Electrical > Combination Meter > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Engine Rpm Engine speed Min.: 0 rpm, Max.: 12750 rpm Actual engine speed -

      Powertrain > Engine and ECT > Data List
      Tester Display
      Engine Speed

      Body Electrical > Combination Meter > Data List
      Tester Display
      Engine Rpm

      Tech Tips


      • When the Data List values of the ECUs match, an internal malfunction of the ECM is suspected.

      • When the Data List values of the ECUs do not match, a signal output error of the ECM or an internal malfunction of the combination meter assembly is suspected.

      OK
      The Data List values of the ECUs do not match.
      Result
      Result
      OK
      NG

    NG

    REPLACE ECM Click here

    OK

  5. CHECK COMBINATION METER ASSEMBLY


    1. Replace the combination meter assembly with a new one.

      Click here

    2. Check that the operation of the tachometer returns to normal.

      OK
      The operation of the tachometer returns to normal.
      Result
      Result
      OK
      NG

    OK

    END (COMBINATION METER ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE ECM Click here